Motor pump unit



March 25, 1941. R. T. CORNELIUS MOTOR PUMP UNIT Filed A ril 17, 1959 3 Sheets-Sheet 1 V I 5 51H 35" K 4 3| M m Richard. T. Cornelius March 25, 1941. R. T. CORNELIUS MOTOR PUMP UNIT Filed April 17; 1939 3 Sheets-Sheet 2 b 6n 1w W 8 l| II! n 7 NA .N\\ fin N mm T A. .1 m: M m on 0Q m iv mm. 3 n a 4 Q. w 5 iv W l A Q n v m v dd 0 o m $0 fiibmza mm M T "n $0 .00 v n m 1Q 3 8 A r h 4.0 H n82 a Nm 1 H a NIH w 3 [I m m v mm m 1 n QM I a R u an 3 4 ma. 1N MN .Nm wj 00 $4 m u n a .2 0% @w IF as 9.. mm H mu m O a\: v 3 E 2 Mm A: 5 mm Q m o. A; 2. Fr 1 0r T 2 .ML. MG 5 v2 i a m *0 1 m m2 .N x m0 M 3 mo 00% March 25, 1941. R. T. CORNELIUS MOTOR PUMP UNIT Filed April 17, 1939 3 Sheets-Sheet 3 rl vkx juvQem o n Richard. T. Cornelius Patented Mar. 25, 1941 UNITED STATES PATENT OFFICE 7 Claims.

My invention relates to motor pump units and has for an object to provide an extremely oompact and efiicient motor pump unit.

An object of the invention resides in providing a motor pump unit by means of which filtered air may be delivered to the pump.

Another object of the invention resides in providing a motor pump unit having a receptacle for storing compressed air.

A feature of the invention resides in constructing a motor pump unit so as to avoid the use of tubes or externally applied means for conducting the air from the pump to the receptacle.

Another object of the invention resides in constructing the motor pump unit with means for cooling the pump and associated, parts.

An object of the invention resides in utilizing a housing and in placing within the housing a case spaced from the walls thereof and forming a passageway between said case and housing.

Another object of the invention resides in attaching the pump to said case and in leading air from said case and to said pump.

Another object of the invention resides in providing a motor having a rotor shaft extending into said case and driving the pump.

A still further object of the invention resides in providing within the housing a partition dividing the housing in two compartments, one of said compartments containing the case and in disposing in the. other compartment a blower for drawing air through the passageway and discharging the same from said other compartment and to the atmosphere.

Another object of the invention resides in spacing the pump and case from the walls of the housing and in providing cooling fins extending between the pump and housing and communicating with the passageway within the first named compartment and leading the air past the pump.

Other objects of the invention reside in the novel combination and arrangement of parts and in the details of construction hereinafter illustrated and described.

In the drawings:

Fig. 1 is a plan view of a motor pump unit illustrating an embodiment of my invention.

Fig. 2 is an elevational sectional view taken substantially on line 22 of Fig. 1.

Fig. 3 is a plan sectional view taken on line 3-3 of Fig. 2.

Fig. 4 is an leleva-tiorral sectional view taken on line 4-4 of Fig. 1.

Fig. 5 is a fragmentary plan View of the motor pump unit with the cover and pressure regulating device removed.

My invention comprises a housing which I have indicated in its entirety by the reference numeral ID. This housing includes a body portion I I open 5 on two opposite sides and constructed with a chamber I2 within the same. The upper portion of the body I0 is provided with a neck I3 to which is attached a,- pump indicated in its entirety by the reference numeral I4. body portion I I is mounted a motor I5 which operates the pump I4. A case I6, within the body portion II, communicates with the pump I4 and serves to direct air to the pump. The air discharged from the pump is led into a receptacle I! mounted on the body portion I I on the side thereof opposite the motor I5. These various parts will now be described in .detail. v

The body portion I I of housing I0 is preferably cylindrical in form at its ends with the axis thereof running horizontally. The two ends of this body portion are open as previously described. Issuing upwardly from the horizontal cylindrical part of the body portion I I is the neck I3 which is also cylindrical and arranged with its axis extending in a vertical direction. The lateral walls of the body portion II are indicated by the reference numeral 23 and extend vertically below the center of the axis of said body portion and are connected to a horizontal bottom 24. A lip 20 extends about the lowermost edge of the body portion. II and serves as a support for the housing II]. A vertical partition 49 in the body portion II divides the chamber I2 into two compartments, In and I2b.

Within the compartment I2a of body portion II is disposed the case I6 which consists of two parallel end walls l8 and I9, side Walls 2| and a bottom 22. The side walls 2| extend vertically while the bottom 22 is. semi-circular in form, as best shown in Fig. 4. All of the walls of the case I6 are spaced from the walls of the housing I0 so that a passageway is formed in compartment I219 which surrounds the case substantially on all sides thereof. The neck I3 is constructed with a 45 cross head 25 which extends across the same and is integral therewith. The walls I8, I9 and 2| of case. I6 issue from this cross head and depend therefrom. Within the case IB is formed a chamber 26.

The housing I0 is supported on a base 34. This base is formed with a flaring wall which terminates at its upper portion in a seat 36 and at lower. portion in a bead 31 extending perimetrically about the same. The base 34 is hol- On one side of thelowed to provide a space 38 within it. In the wall 35 is cast a number of bosses 39 to which eludes a diaphragm 51.

are attached rubber feet 4|. These feet support the base in a raised position above the surface on which the base rests so that the head 31 is disposed above such surface to provide a passageway 42 therebetween for a purpose to be presently described.

The motor I 5 consists of a stator core 21 which is provided with windings 39 of conventional form. Rotatable within the stator 21 is a rotor 28 which is mountedon a motor shaft 29. The

motor I5 is of the condenser type and for the purpose a condenser 49 is employed which is connected to the proper windings of the stator of the motor through conductors 3|. Condenser 49 is mounted in a pocket 32 formed by a wall structure 33, cast in the base 34 of the device. The core 21 fits snugly within a tubular member 43 which is seated in a seat 44 formed in the body portion I at one of the open ends thereof. The tubular member 43 is closed at its other end by means of an end bell 45 which is formed with a recess 46 in which said tubular member is seated. The various parts of the motor are clamped together by means of bolts 41 which are screwed into the partition 49. These bolts have nuts 43 screwed upon the ends thereof which engage the end bell 45 :and clamp the parts in position. The partition 49 has an opening 5| in it through which the motor shaft 29 extends. This shaft is journalled in two ball bearings 52 and 53. The ball bearing 52 is mounted in a boss 54 cast in the end ball 45, while the ball bearing 53 is mounted in a boss 55 cast in the wall I8 of case IS. The shaft 29 is of such dimensions that the extreme end 56 thereof projects through the wall I8 and inwardly into the chamber 26 within the case I6.

The pump I4 is of the diaphragm type and in- This diaphragm is supported in the following manner. Formed in the cross head 25 of housing I9 is a ring 58. This ring is connected by means of fins 59 with the neck I3. Ring 58 is directly connected to the walls I8, I9 and 2| of the case I6. The dia phragm 51 rests directly upon the upper surface of the ring 58 and is secured thereto by means of a head or pump body 6|. Head 6| is constructed with a flange 62 which overlies the ring 58. The head 6! includes a central portion 63 connected by means of fins 64 with an'annular rim 65. By means of the said fins and the fins 59, of body portion H, passageways are provided which are indicated at 66 in Fig. 5, which passageways communicate with the chamber I2, within the housing I9. The rim 65 is of such dimensions that it fits upon the neck I3 and forms a continuation thereof. The head 6| is secured to the neck I3 by means of screws 61 which pass through the flange 52 and are threaded into the ring 58.

The pump I4 further includes a piston 68 which is cast integral with a connecting rod 69. Piston 63 is disposed upon one side of the dia phragm 51. Upon the other side of the dia phragm 51 is disposed a plate 69 which is'attached to the piston 68 by means of screws II. Within the head 6! is formed a cavity I2 which serves as the expansible chamber of the pump. A valve I3,

in the piston 68, conducts air from the chamber 26 in case I6 to the cavity I2. Another valve I4 leads the air compressed in the cavity I2 into a,

96. This eccentric has secured to it a ball bearing 91 which is mounted in a boss 98 formed on the end of the connecting rod 69. As the shaft 56 rotates connecting rod 69 is reciprocated and the diaphragm 51 caused to oscillate to pump air. The eccentric 96 has cast integral with it a counter-weight 99, which counter balances the effect of the piston 69 and the connecting rod 69 and causes the pump to run smoothly.

The receptacle II consists of a dome-shaped wall structure 8| which is formed with lugs 82 projecting outwardly therefrom at the open end thereof. The receptacle I I is secured to the body portion II of housing I9 by means of screws 83 which are threaded into said housing and which extend through the lugs 92. The Wall structure 8|, at the open end thereof, is formed with an inwardly turned flange 94. Overlying this flange is a closure 85 which is itself formed with a flange 86 seated upon the flange 84. Screws 81 secure the two flanges together and form a complete fluid tight chamber 88 within the receptacle II.

Communicating with the valve I4, as best shown in Fig. 2, is a passageway I6 which is formed in an enlargement I8 of one of the fins 64. This passageway communicates with another passageway 11 which extends through the said enlargement I8, the diaphragm 51 and through the cross head 25. This passageway communicates with still another passageway 19 formed in O the said cross head which extends through a boss 89 formed on the wall structure 8| of receptacle IT. A port 9| in said wall structure brings the passageway I9 into communication with the chamber 83 of said receptacle. It will thus be noted that air pumped by the diaphragm 51 is forced through the valve I4 and passes along the passageway I6, TI, I9 and the port 9| into the chamber 88 where the same is stored.

For conducting the air from the chamber 89, a nipple 92 is employed which is connected through a coupling 93 with a fitting 94 screwed into the wall structure 8| of receptacle II.

The closure 85 of receptacle II is constructed with an end wall I9 I. -This end wall has a tubular lip I92 extending outwardly therefrom. Encircling this lip is an annular. filter I93. In the wall I9 of case I6 is formed an opening I94 which is surrounded by a lip I95. The filter I93 is of such dimensions that the same engages said lip and closes the opening between the end wall |9| of closure 85 and the lip I95. It will thus be seen that air entering the chamber 26 passes through the filter I93.

The pressure within the chamber I5 is controlled by a pressure regulated switch I96 which is connected to the motor I5. This switch forming no particular feature of the instant invention will not be described in detail. The switch I96 is enclosed by means of a cover I91 which overlies the skirt 65 of head 6| and is attached thereto by means of screws I98 which are threaded into the flange 62 of head 6|. The switch I06 includes an adjusting screw I99 which is screwed into the cover I91 and by means of which the pressure in the chamber 88 may be regulated.

The pressure within the chamber I5 is indicated by a pressure gauge III. This pressure gauge is disposed within a recess I I2 formed in the skirt 65 and the cover I91. The said gauge is provided with a nipple screwed into a threaded opening H3 in the head 6| which communicates with chamber I5. V

For the purpose of cooling the pump I4 and associated structures the shaft 29 has attached to it a blower rotor IN. This rotor is disposed in compartment I2a and fits in the opening 5| in partition 49. Air entering the compartment I2b of chamber I2 is drawn through the opening SI and discharged by .the rotor at the periphery thereof and into compartment I2a on the opposite side of the partition 49. For leading the air from the blower rotor II4 an opening H5 is formed in the bottom 24 of the housing III. This opening communicates With compartment I2a and the space 38 Within the base 34. The cover I9! is constructed with a plurality of air inlets I IS in the upper portion of the same which lead air into the interior of the said cover.

In addition to the blower rotor II4 the usual air circulating fan, such as indicated at H1 in Fig. 2, is provided on the motor shaft 29. This fan causes circulation of air through openings H8 in the end bell 45.

The operation of the invention is as follows: When the switch I06 operates, the motor I5 is energized and shaft 29 rotated. The eccentric 96 thereon causes the connecting rod 69 and piston I58 to reciprocate and operates pump I4 which pumps air. The air enters through the openings I IS in cover I01, and passes through the passageways 66 and into compartment I2b of chamber I2. From compartment I2b the air passes through the filter I03 and into chamber 26. From chamber 26 air passes through the intake valve I3 and into the compression chamber I2. From here the air passes through the exhaust valve 14 and into the chamber I5 and the passageway 16. The air in chamber I5 operates the gauge III and also the switch I96 to cut off energization of the motor when the pressure within the chamber I5 reaches a predetermined amount determined by the adjusting screw I09. The air entering passageway 16 passes successively through the passageways I1, I9 and the port 9| and into the chamber 88 of receptacle IT. From here the air is drawn as desired from the nipple 92. Operation of the motor I5 causes rotation of the blower I4 which also draws air through the passageways I I6 and 66 into the compartment I2b of chamber I2. The air passes through the opening 5| in the partition 49 and into compartment I2a and is discharged from the blower rotor II4 leaving housing I9 through the opening H5 in the bottom 24 thereof. The air upon leaving housing ID finally passes into the space 38 and out of the device through the passageway 42.

The advantages of my invention are manifest. An extremely neat and compact construction results which occupies a minimum amount of space. The device is symmetrical in appearance. By the arrangement of air circulating ducts the pump is maintained cool and will therefore operate for an exceedingly long period of time without attention. Since all of the ball bearings are packed with lubricant the motor needs no lubricating. The air entering the pump is filtered so that clogging of the valves of the pump through the accumulation of dirt is prevented. By removal of the air receptacle access to the filter may be had. No pipes, tubes or external connections for leading the air from the pump to the receptacle are required. The device utilizes a minimum number of moving parts.

Changes in the specific form of my invention, as herein disclosed, may be made within the scope of what is claimed without departing from the spirit of my invention.

Having described my invention, what I claim as new and desire to protect by Letters Patent is:

1. In a motor pump unit, a housing, a case within said housing spaced from the walls of said housing and providing a, passageway therebetween, said case having a chamber therein, a pump disposed adjacent said case and causing flow of air through said chamber, a receptacle disposed adjacent said case and carried by said housing, said receptacle having a wall spaced from one of the walls of the case, an opening in the wall of the case opposite said receptacle, a lip on said receptacle disposed opposite the opening in said case and an annular filter encircling said lip and engaging said receptacle and case and forming a filtering passageway between the passageway in said housing and the chamber within the case.

2. In a motor pump unit, a housing open at its ends, a pump situated at the uppermost portion of the housing, a case within the housin having a chamber therein through which air is pumped by said pump, a motor connected to the housing at one of the open ends thereof and having a motor shaft extending into said case and operating said pump, said case having an opening in one of the walls thereof facing the other open end of the housing, a receptacle attached to the other end of the said housing and having a wall spaced from and opposite the opening of said case and a filter disposed between the wall of said receptacle and the opening in said case and forming a filtering passageway between the interior of the housing and the chamber within said case.

3. In a pump unit, a housing having an opening therein, a ring disposed within said opening and spaced therefrom, fins extending from said ring to the walls of the housing and holding the ring Within said opening, a head superimposing said ring, a pump diaphragm clamped between said head and ring, a rim encircling the opening in the pump housing and connected to the pump housing, fins extending between said rim and head and forming openings communicating with the openings in the housing, pump means associated with said diaphragm and means for drawing air successively through the two sets of openings to cool the parts of the pump.

4. In a pump unit, a housing having a cross head, a receptacle carried by said housing, a diaphragm extending across said cross head, a head super-imposing said cross head for clamping the diaphragm in position, said second named head having a cavity forming a pump chamber and passageways leading therefrom, said housing having other passageways communicating with the receptacle, said passageways extending through said diaphragm and communicating with said first named passageways and means for reciprocating said diaphragm.

5. In a motor pump unit, a housing, a case within said housing spaced from the walls of said housing and providing a passageway therebetween, said case having a chamber therein, a pump disposed adjacent said case and causing flow of air into said chamber, a receptacle disposed adjacent said case and carried by said housing, said receptacle having a wall spaced from one of the walls of the case, an opening in the wall of the case opposite said receptacle, a

, filter disposed between said wall of the receptacle means forming a. passageway between said pump and receptacle.

6. In a pump unit, a housing having a wall structure provided with a plurality of circumferentially arranged openings therein defining a circular portion, a head super-imposing said circular portion, a pump diaphragm clamped between said head and circular portion, a rim encircling the openings in said wall structure and connected to the pump housing, fins extending between said rim and head and forming openings therebetween communicating with the openings in said wall structure of the housing, pump means associated with said diaphragm, and means for drawing air successively through the two sets of openings to cool the parts of the pump.

7. In a pump unit, a housing having a cross head, a receptacle carried by said housing, a

diaphragm extending across said cross head, a head super-imposing said cross head for c1amping the diaphragm in position, said second named head having a cavity forming a pump chamber, a piston connected to said diaphragm, said piston and diaphragm having a passageway therethrough communicating with the interior of said housing, a valve for closing said passageway, a passageway leading from said pump chamber, said housing having other passageways communicating with said receptacle, said last named passageways extending through the diaphragm and communicating with said second named passageway whereby the fluid circulated is drawn through the first named passageway into said pump chamber and out through. the second named passageway and into said receptacle.

RICHARD T. CORNELIUS. 

